Any rule not specified for the variants listed below can be assumed to be unchanged from in regular four in a row.
Anti Four in a Row
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1
A
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G
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Rules
The player who connects four pieces in a row loses .
Neither player may place a piece atop the last piece placed by the opponent.
Rule 2 is not applied if there is only one column left to play in.
If the board is filled without either player making four in a row, White wins.
An 8x8 board is generally used.
Play Multiplayer
BrainKing.com Turn-based play, identified as "Anti Line4"
GoldToken.com Turn-based play, identified as "Giveaway Four In a Row," paid membership required
ItsYourTurn.com Turn-based play, identified as "Anti Stack4"
Four in a Rowtris
8
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1
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Rules
As soon as the first row of the board is completely occupied, all pieces in this row are removed, causing all pieces above to shift down one row.
If a move occupies the last open space on the first row but also completes four in a row, Rule 1 is not applied; instead, the player who made that move wins.
An 8x8 board is generally used.
Play Multiplayer
BrainKing.com Turn-based play, identified as "Linetris"
GoldToken.com Turn-based play, identified as "Quicksand Four In a Row," paid membership required
ItsYourTurn.com Turn-based play, identified as "Connectris"
Jijbent.nl Turn-based play, identified as "4 op een rij (tetris)"
Richard's PBeM Server Play by email, 7x6 board, identified as "Connectris"
Play a Computer
4 op een rij (tetris) oefenen Java applet
Qubic
Rules
Four 4x4 grids are stacked one above the other, representing a three-dimensional 4x4x4 board of 64 spaces.
On any given turn, a piece can be placed in any unoccupied space on any of the four grids.
A winning line of four can be made in any direction, including spanning the four grids (note how white wins in the diagram).
Play Multiplayer
Richard's PBeM Server Play by email
Play a Computer
3D Tic Tac Toe Java applet by Chris Malumphy
3D Tic-Tac-Toe JavaScript by Bo Johansson, versions with and without graphics available
Notes
In 1980, Oren Patashnik published "Qubic: 4x4x4 Tic-Tac-Toe," in Mathematics Magazine (Volume 53, Number 4, Pages: 202-216), solving Qubic as a first-player win.
How to play Qubic (3-d Tic Tac Toe) is an online guide to the game.
Spider Four in a Row
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1
A
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G
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Rules
Pieces can be stacked up from any side. In other words, on any given turn, a piece can be placed in any unoccupied space which is:
one of the edge spaces (a1, h8, etc.), or
connected to an edge space by a vertical or horizontal line of pieces.
An 8x8 board is generally used.
Play Multiplayer
BrainKing.com Turn-based play, identified as "Spider Line4"
GoldToken.com Turn-based play, identified as "Zero G Four In a Row," paid membership required
ItsYourTurn.com Turn-based play, identified as "Stack 4X4"
